Free piston engine

Claim 1

IN AN INTERNAL COMBUSTION ENGINE OF THE FREE PISTON TYPE, THE COMBINATION COMPRISING A POWER CYLINDER, AT LEAST ONE POWER PISTON ADAPTED TO RECIPROCATE WITHIN SAID POWER CYLINDER, AT LEAST ONE PUMP CHAMBER DEFINED IN PART BY EXTENSIONS OF SAID POWER PISTON AND SAID POWER CYLINDER, AT LEAST ONE REBOUNCE DEVICE, MEANS OPERATIVELY ASSOCIATED WITH SAID POWER PISTON FOR COMPRESSING ELASTIC MATERIAL OF SAID REBOUNCE DEVICE ON THE COMBUSTION STROKE OF SAID POWER PISTON, THE ENERGY IN SAID COMPRESSED ELASTIC MATERIAL DRIVING THE POWER PISTON ON THE COMPRESSION OF SAID POWER PISTON, THE ENERGY IN SAID COMPRESSED ELASTIC MATERIAL DRIVING THE POWER PISTON ON THE COMPRESSION STROKE; A FUEL METER IN OPERATIVE CONNECTION TO A FUEL SUPPLY FOR ADMITTING FUEL TO SAID CYLINDER, A SERVOMOTOR IN OPERATIVE CONNECTION TO SAID FUEL METER, A POWER PISTON POSITION SENSING MEANS AFFIXED TO AND PENETRATING SAID POWER CYLINDER SUCH THAT THE POSITION OF SAID POWER PISTON IS DIRECTLY SENSED, SAID POSITION SENSING MEANS BEING IN OPERATIVE CONNECTION WITH SAID SERVOMOTOR TO AFFECT THE FUEL RATE OF SAID ENGINE IN RESPONSE TO THE MOST OUTWARD POSITION OF SAID POWER PISTON.